JPH0673519B2 - Attachment structure of puncture needle in blood sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention punctures a person's earlobe with a needle to allow a small amount of blood to flow out and collect blood for performing a blood test or the like using the blood. The present invention relates to a mounting structure for a puncture needle in a device.

[Prior Art] It is desirable that such a puncture should be performed rapidly so that the person does not feel pain. Therefore, various puncture mechanisms have been considered.

Conventionally, an insertion hole having a circular cross section is provided in a needle mounting portion of such a blood collecting tool, and a puncture needle having a circular cross section is inserted into the insertion hole.

Further, in consideration of replacement of the puncture needle, an insertion hole is provided in the needle attachment portion for a detachable connecting member, and the puncture needle is inserted into the insertion hole.

[Problems to be Solved by the Invention] In the puncture needle mounting structure described above, the puncture needle needs to be tightly fitted into the insertion hole so that the puncture needle does not accidentally fall out of the insertion hole. It is difficult to make it removable from the insertion hole. Therefore, although the connecting member is required as described above, the presence of this connecting member causes a problem that the number of parts increases and it takes time to assemble the puncture needle.

The present invention, in a blood sampling device having a structure in which a puncture needle is directly inserted into a needle attachment portion, prevents the puncture needle from slipping out and improves the shape of the insertion portion of the needle attachment portion and the puncture needle while preventing the puncture needle from falling off. It is intended to be removable.

Configuration of the Invention [Means for Solving the Problems] In view of this object, a blood collecting tool according to the present invention is provided with an insertion groove 17 in a needle mounting portion 7 while a needle plate is provided, as shown in the drawings of an embodiment described later. When 15 is formed in a cross-sectional shape and a needle tip 16 is formed at its tip, and when this needle plate 15 is inserted into the insertion groove 17 of the needle mounting portion 7, the needle tip 16 of the needle plate 15 is removed from the needle mounting portion 7. Provided in the insertion groove 17 are a protruding portion and a locking portion 18 that supports the bent portion 15a of the needle plate 15 and a locking portion 19 that supports both ends 15b of the needle plate 15,
The bent portion 15a and both end portions 15b of the throat plate 15 are respectively engaged with the engaging portions of the insertion groove 17.
The needle plate 15 is pressed against 18 and 19 by the elasticity of the needle plate 15.

[Operation] In the present invention, when the needle plate 15 of the puncture needle 14 is inserted into the insertion groove 17 of the needle mounting portion 7, the bent portion 15a and both end portions 15b of the needle plate 15 are inserted.
Are pressed against and supported by the respective locking portions 18 and 19 in the insertion groove 7.

When exchanging the puncture needle 14, both ends 15b of the needle plate 5 are slightly spread apart to be separated from both the locking portions 19 of the insertion groove 17, and then the needle plate 5 is pulled out.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, a cap 2 is fitted on the front end of the holder 1, and a puncture hole 3 is formed on the front end of the cap 2. A plunger 4 is inserted into the holder 1 and the cap 2 so as to be movable in the longitudinal direction. The plunger 4 includes an operating portion 5 having a leaf spring portion 6 and the operating portion 5
The needle attachment portion 7 is integrally formed at the front end of the operation portion 5, and the spring attachment portion 8 is integrally formed at the rear end of the operation portion 5. A pullback member 9 is attached to the rear end of the spring mounting portion 8, and the rear portion of the pullback member 9 projects from the rear end of the holder 1. A locking hole 10 is formed near the front end of the holder 1 so that the locking projection 6a formed on the leaf spring portion 6 of the operating portion 5 can be disengaged from the locking hole 10 as the plunger 4 moves. Has become.
A locking projection 11 is formed on the inner periphery of the substantially central portion of the holder 1, and a first compression coil spring is formed on the outer circumference of the spring mounting portion 8 between the locking projection 11 and the rear end of the operating portion 5. The second compression coil spring 13 is inserted into the outer periphery of the spring attachment portion 8 between the locking projection 11 and the front end of the pullback member 9 while the insertion 12 is inserted.

In particular, in this embodiment, the device for attaching the puncture needle 14 to the needle attaching portion 7 of the plunger 4 is devised.

As shown in FIGS. 4 and 5, the puncture needle 14 is composed of a needle plate 15 bent into a cross section, and a needle tip 16 is formed at the tip of the needle plate 15. On the other hand, an insertion groove 17 is formed in the needle mounting portion 7 so as to extend in the axial direction from the front end thereof, and the front end side and both sides of the insertion groove 17 are open. Of the two inner surfaces of the insertion groove 17 facing each other, a locking groove 18 is formed in the central portion of one inner surface so as to extend in the axial direction, and a locking surface 19 is formed on both side edges of the other inner surface. It is formed so as to extend in the axial direction. Then, with the needle plate 15 of the puncture needle 14 inserted in the insertion groove 17 of the needle mounting portion 7, the front portion of the needle plate 15 including the needle tip 16 projects forward from the front end of the needle mounting portion 7, and Board 15
Both end portions 15b of the projecting portions project from both sides of the insertion groove 17. The bent portion 15a of the needle plate 15 has a locking groove 18 on one inner surface in the insertion groove 17.
The needle plate 15 is supported at both ends 15b by the locking surfaces 19 on both side edges of the other inner surface. At this time, the bent portion 15a and both end portions 15b of the needle plate 15 are pressed against the locking groove 18 and both locking surfaces 19 by the elasticity of the needle plate 15.

The puncture needle 14 of this embodiment is contained in a packaging bag 20 as shown in FIG. A notch 21 is formed at the center of one side edge of the packaging bag 20. The front part of the needle plate 15 including the needle tip 16 is accommodated in the one bag portion 20a divided by the cut 21, and the rear part of the needle plate 15 is accommodated in the other bag portion 20b. There is.

When the puncture needle 14 thus stored in the packaging bag 20 is inserted into the needle mounting portion 7 described above, first, one bag portion 20a
Grip the other bag part 20b and tear the other bag part 20b at the notch 21 to
Separate a and 20b as shown in FIG. The rear portion of the needle plate 15 projects from the one bag portion 20a. The rear portion of the needle plate 15 is inserted into the insertion groove 17 of the needle mounting portion 7 and held as described above.

The blood collecting tool thus configured is used as follows.

In the unused state shown in FIG. 1, the first and second compression coil springs 12 and 13 do not bias the plunger 4, so that the plunger 4 is free. The puncture needle 14 is located inside the cap 2, and its needle tip 16 is slightly retracted inside the puncture hole 3. The locking projection 6a of the operating portion 5 of the plunger 4 is located near the rear end of the cap 2 apart from the locking hole 10 of the holder 1.

When the pullback member 9 is pulled rearward from this state as shown in FIG. 2, the plunger 4 moves rearward and the needle tip of the puncture needle 14 is moved.
16 separates from the puncture hole 3 of the cap 2 and the locking projection 6a of the operation portion 5 is engaged with the locking hole 10 of the holder 1 so that the plunger 4 resists the urging force of the first compression coil spring 12. Stop inside holder 1.

When the locking projection 6a of the operation portion 5 is pushed from this state, the locking projection 6a is disengaged from the locking hole 10 of the holder 1 and the plunger 4 of the first compression coil spring 12 is released, as shown in FIG. Due to the biasing force, the needle tip 16 of the puncture needle 14 rapidly moves forward and projects from the puncture hole 3 of the cap 2. The needle tip 16 damages a person's skin and a small amount of blood flows out. When the needlepoint 16 projects in this manner, the second compression coil spring 13 is compressed, and the urging force of the second compression coil spring 13 causes the plunger 4 to rapidly move rearward. Immediately after the needle tip 16 of the puncture needle 14 projects from the puncture hole 3 of the cap 2, the puncture needle 14 is retracted into the puncture hole 3 and returns to the state shown in FIG.

In particular, in this embodiment, when the needle plate 15 of the puncture needle 14 is inserted into the insertion groove 17 of the needle mounting portion 7, the bent portions 15a and both ends 15b of the needle plate 15 are formed on the inner surfaces of the insertion groove 7 facing each other. Since the puncture needle 14 is pressed against and supported by the locking groove 18 and both locking surfaces 19, the puncture needle 14 can be securely attached to the needle mounting portion 7 without falling off. Moreover, when replacing the puncture needle 14, both ends of the needle plate 5
The puncture needle 14 can be easily detached from the needle mounting portion 7 by slightly expanding 15b and separating it from both locking surfaces 19 of the insertion groove 17 and pulling it out.

EFFECTS OF THE INVENTION According to the present invention, the puncture needle 14 can be securely attached to the needle attachment portion 7 without falling off. Moreover, when replacing the puncture needle 14, the puncture needle 14 can be easily removed from the needle attachment portion 7.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a non-used state of the blood collecting tool according to the present embodiment, FIG. 2 is a cross-sectional view showing a state in which a pullback member is pulled rearward from the state shown in FIG. 1, and FIG. 3 is a puncture needle. Sectional view showing a state in which the needle tip protrudes when the needle rapidly reciprocates,
1 is a partial perspective view showing a state in which the cap is removed from the holder in the blood collecting tool shown in FIG. 1, FIG. 5 is an enlarged cross-sectional view of a needle mounting portion, and FIG. 6 shows a state in which a puncture needle is stored in a packaging bag. FIG. 7 is a perspective view showing a state in which the packaging bag is broken, and FIG. 8 is a perspective view showing a state in which the puncture needle in the packaging bag is attached. 7 ... Needle mount, 14 ... Puncture needle, 15 ... Needle plate, 15a ...
Bent part, 15b …… End part, 16 …… Needle tip, 17 …… Insertion groove, 18
…… Locking groove (locking part), 19 …… Locking surface (locking part).

Claims (1)

[Claims] 1. A needle mounting portion (7) is provided with an insertion groove (17), on the other hand, a needle plate (15) is bent into a cross-sectional shape and a needle tip (16) is formed at the tip thereof. When the plate (15) is inserted into the insertion groove (17) of the needle mounting part (7), the needle tip (16) of the needle plate (15) is projected from the needle mounting part (7) and the needle plate (15) A locking part (18) for supporting the bent part (15a) of the needle and a locking part (19) for supporting both ends (15b) of the throat plate (15) are provided in the insertion groove (17), and the throat plate Bend (15a) and both ends (15) of (15)
b) Insert the needle plate (1
5) The attachment structure of the puncture needle in the blood sampling device, which is pressed by the elasticity possessed by 5).